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The fact that you invoked and talked to a comic book character in your head means you might want to take a break from the occult and get more grounded in reality.
It is a perfectly valid approach to invocation. The question would be the method of invocation.
A lot of people will pick a particular god/goddess, or a comic book character, or a demon, etc., which probably will include some cursory examination of said 'entity's qualities, temperaments, associations, etc.
But just knowing that stuff doesn't amount to much in terms of magical actions. If you want to pull of an invocation, you should be looking into the history and mythology of an entity, get a sense of the personality and principles that are a part of that entity. "Oh Buffy Somers, please come dwell within me and make me strong like you are!" is not enough for an invocation. You should spend time to really get into that entity's frame of mind, its perspective, understand its relationship to humanity - even through fiction. All 'characters' either classically mythological or 'fictional' are archetypes, and those archetypes are not new, no matter how new or old a 'character' is.
You can do invocations to djinn, to favorite gods or goddesses, to buffy somers, to the devil him/itself but if you haven't developed any kind of sympathetic psychic connection, you could get anything, including your own manifestations of your interpretation (on the unconscious level) of what that 'character' is supposed to be - and that comes loaded will all your own neuroses, through a very dirty lense in most cases (we all have a dirty lense, if we need to invoke in the first place.)
Invocation, then, doesn't have to be a single ritual act. Classical evocation isn't a single act, is it? Not really - all books discuss preparations that take days, week, even months to enact properly, and commentaries further invite the would-be evoker to dwell on the nature of the evocation, on the properties of the spirit evoked, the ritual elements, etc.
Invocation is the same way - a process for which the formal ritual, in whatever form, if there even is one - is but the culmination, the climax of those preparations, those days spent focused on gaining sympathy with the being and with the act of invocation itself.
So, just because you do an invocation and -something- happens, but its not what you wanted/expected, doesn't mean that invocation doesn't work for you, or that anything negative took you over, or even that anything really happened at all. Usually, the primary problem in a failed invocation is that there was no work really put into it. No heart, to sympathy applied to the principle being invoked.
Give the same method a try again, but this time really put heart into it. Write a paper if it helps (it does for me) on the history, personality, and character of a particular being. Read a different myth and really consider the subject entity's role in the myth, their dynamic with with the other mythological characters. Try to recognize what part of you they actually connect to, what element of human psyche or character they actually represent. Look at how that part of you interacts with the other parts and try to draw parallels. Attempt to understand how that character is
already present within you, and then begin preparation for invocation. Spend a few days
after planning our or setting up the necessary ritual elements, really focusing on the act and building it up in your mind. When you get there, don't just mutter your invocations, don't say them robotically from wrote: throw yourself into them, work yourself up into a frenzy, call to this entity that you now know intimately as though calling to a lost lover, as though trying to call you brother, sister, father, mother, husband, wife, even your child, back from beyond the grave. Cry, scream, laugh, whatever seems appropriate, and let that being know that you are calling to them with a passion.
And then, you'll know what an invocation really feels like.
peace